1 /*
2  * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
3  *
4  * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
5  *
6  * Based on sandpoint.c by Mark A. Greer
7  *
8  * This file is licensed under the terms of the GNU General Public License
9  * version 2.  This program is licensed "as is" without any warranty of
10  * any kind, whether express or implied.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/initrd.h>
15 #include <linux/of_platform.h>
16 
17 #include <asm/time.h>
18 #include <asm/mpic.h>
19 #include <asm/pci-bridge.h>
20 
21 #include "mpc10x.h"
22 
23 static const struct of_device_id of_bus_ids[] __initconst = {
24 	{ .type = "soc", },
25 	{ .compatible = "simple-bus", },
26 	{},
27 };
28 
29 static int __init declare_of_platform_devices(void)
30 {
31 	of_platform_bus_probe(NULL, of_bus_ids, NULL);
32 	return 0;
33 }
34 machine_device_initcall(linkstation, declare_of_platform_devices);
35 
36 static int __init linkstation_add_bridge(struct device_node *dev)
37 {
38 #ifdef CONFIG_PCI
39 	int len;
40 	struct pci_controller *hose;
41 	const int *bus_range;
42 
43 	printk("Adding PCI host bridge %pOF\n", dev);
44 
45 	bus_range = of_get_property(dev, "bus-range", &len);
46 	if (bus_range == NULL || len < 2 * sizeof(int))
47 		printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
48 				" bus 0\n", dev);
49 
50 	hose = pcibios_alloc_controller(dev);
51 	if (hose == NULL)
52 		return -ENOMEM;
53 	hose->first_busno = bus_range ? bus_range[0] : 0;
54 	hose->last_busno = bus_range ? bus_range[1] : 0xff;
55 	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
56 
57 	/* Interpret the "ranges" property */
58 	/* This also maps the I/O region and sets isa_io/mem_base */
59 	pci_process_bridge_OF_ranges(hose, dev, 1);
60 #endif
61 	return 0;
62 }
63 
64 static void __init linkstation_setup_arch(void)
65 {
66 	printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
67 	printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
68 }
69 
70 static void __init linkstation_setup_pci(void)
71 {
72 	struct device_node *np;
73 
74 	/* Lookup PCI host bridges */
75 	for_each_compatible_node(np, "pci", "mpc10x-pci")
76 		linkstation_add_bridge(np);
77 }
78 
79 /*
80  * Interrupt setup and service.  Interrupts on the linkstation come
81  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
82  */
83 static void __init linkstation_init_IRQ(void)
84 {
85 	struct mpic *mpic;
86 
87 	mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
88 	BUG_ON(mpic == NULL);
89 
90 	/* PCI IRQs */
91 	mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);
92 
93 	/* I2C */
94 	mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);
95 
96 	/* ttyS0, ttyS1 */
97 	mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);
98 
99 	mpic_init(mpic);
100 }
101 
102 extern void avr_uart_configure(void);
103 extern void avr_uart_send(const char);
104 
105 static void __noreturn linkstation_restart(char *cmd)
106 {
107 	local_irq_disable();
108 
109 	/* Reset system via AVR */
110 	avr_uart_configure();
111 	/* Send reboot command */
112 	avr_uart_send('C');
113 
114 	for(;;)  /* Spin until reset happens */
115 		avr_uart_send('G');	/* "kick" */
116 }
117 
118 static void __noreturn linkstation_power_off(void)
119 {
120 	local_irq_disable();
121 
122 	/* Power down system via AVR */
123 	avr_uart_configure();
124 	/* send shutdown command */
125 	avr_uart_send('E');
126 
127 	for(;;)  /* Spin until power-off happens */
128 		avr_uart_send('G');	/* "kick" */
129 	/* NOTREACHED */
130 }
131 
132 static void __noreturn linkstation_halt(void)
133 {
134 	linkstation_power_off();
135 	/* NOTREACHED */
136 }
137 
138 static void linkstation_show_cpuinfo(struct seq_file *m)
139 {
140 	seq_printf(m, "vendor\t\t: Buffalo Technology\n");
141 	seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
142 }
143 
144 static int __init linkstation_probe(void)
145 {
146 	if (!of_machine_is_compatible("linkstation"))
147 		return 0;
148 
149 	pm_power_off = linkstation_power_off;
150 
151 	return 1;
152 }
153 
154 define_machine(linkstation){
155 	.name 			= "Buffalo Linkstation",
156 	.probe 			= linkstation_probe,
157 	.setup_arch 		= linkstation_setup_arch,
158 	.discover_phbs		= linkstation_setup_pci,
159 	.init_IRQ 		= linkstation_init_IRQ,
160 	.show_cpuinfo 		= linkstation_show_cpuinfo,
161 	.get_irq 		= mpic_get_irq,
162 	.restart 		= linkstation_restart,
163 	.halt	 		= linkstation_halt,
164 	.calibrate_decr 	= generic_calibrate_decr,
165 };
166